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2015-09-17MLK-10455-3 ARM: imx: add different DDR type support for imx7d retentionAnson Huang
On i.MX7D, LPDDR3 and DDR3 have different retention flow, need to add DDR type check during initialization. Some DDR configurations may be updated lated, so it is better to just read it from register instead of hard coding. Signed-off-by: Anson Huang <b20788@freescale.com>